I have a particular nice system that communicte through different DSL routers for backups. The problem is the remote is reachable through my default gateway however for security i need to controll the physical interface/ip it uses to communicate with. I also need to select this path at will.

It's base is ssh - specifically scp.

I can ping through these interfces with
or
(-I interface address = Set source address to specified interface address. Argument may be numeric IP address or name of device. When pinging IPv6 link-local address this option is required.)

My requirement is to make an SCP / SSH connection but selectively force it through an particular interface/IP router.

Does anyone have an Elagant way?

My Scripts is all BASH

Is that all your script is? That really can't be all...

It indicate that I use Bash - sh

A solution using perl/java/c++ etc whatever will prolly not fit into my current application. Althow all suggestions is welcome.

Maybe you can use the -b switch for using a different bind address? Do a man ssh and man scp for more information.

I have tried the ssh -b {ipliteral}before and now again, both work but it go through the same gateway, the bind seem to be not routing the traffic any other way.
How i test this is checking whether my ssh comes from an certain IP and using the -b result in the IP of only one router - the same one every time. I could not find (Google) any samples where the -b was used either.

Do you understand how to use the -b modifier? For example, if I issued ssh -b 10.0.0.1 10.0.2.1 it would use the interface that is assigned 10.0.0.1 (eth0). Whereas if I issued it with -b 10.0.1.1 10.0.2.1 it would use the 1.1 interface (wlan0). Hope that helps.